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Krib Agression

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I have 2 kribs and 3 zebra danios along with an algae eater in a 20 gallon high. There are many rocks and a couple caves. I know I have one male for sure but i'm not 100 % sure that the other is a female. It doesn't have the red belly like most females and it always gets chased by the male. I've had them for about 2 weeks and the male has a cave picked out and whenever the other krib comes anywhere near it he chases it. I was told it was a female at the store and I thought so too at the time, but now i'm not so sure.

I presume you are talking about the kribs. the fish in picture is pretty much 99% chance male. females would be much less elongated, with a larger belly and shorter fins.

Madagascariensis is right on, that Krib in the picture is a male. I would re-home or trade it back to the store. Nothing good will come from 2 males in a small foot print tank. If the tank was longer with a few caves in it you might be able to keep them both happy, again might.